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anyone interested in a jung regulator pcb group buy?

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#121
peranders said:
No Swedes are interested.... Just wondering, how do you solve the postage expenses? I think this kind of distribution seems to be complicated. Isn't it better that you do the BrainGT thing and take some money for your work and do it all by yourself? It's only 26 people.
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Peranders,

Have you really thought about the statement above what is so complicated and what would be more expensive for all involved (26 parcels from the uk or one parcel from the uk and 26 follow-on smaller parcels closer to the destination).
I don’t wish to make money from this and the term volunteer means just that.
🙄
 
#123
The numbers on the boards is getting pretty high. What is the next price break? I'd be interested in ordering more boards if it got even cheaper.

Will there be an opportunity to order more boards if the price can be brought down? I'm going away for the weekend, will be back Sunday night (deadline!), so will be out of touch until then. I think we could easily hit 200 boards of each!

RonS
 
#124
The following members have had the 22uf Za's reduced or removed from the order due to them being added after we had excided the 80 that are available
timH (reduced back to 9 from 11)
analog_sa
jonk
Calimero (as Calimero has volunteered for the organisation and delivery maybe one of the Europe members would be willing to reduce there 22uf order).
PrimeCase

The Totals so far are:
+Ve Boards Total 164
-Ve Boards Total 124
100u, 35V ZA's 210
100u, 10V ZA's 105
47u, 35V ZA's 105
22u, 35V ZA's 80 no more left see post 108
 
#126
Revised price break

I've just received a revised quote from the PCB supplier, I can get another break at 200off, which looks potentially feasible for the +ve boards.

The price would be £632.15 for 200off, making a unit price of £3.16 ea. which is a worthwhile improvement.

The next break I was quoted was 500off, but I don't think we'll get there 😉

Hope this helps,

Andy.
 
#127
Would anyone please post some application advice and limitations for these boards for us "novice" DIYers. Like current limitations, parts selection/suggestion, what come before and what should be after the board, the correct placement to get the most benefit . . . etc.
Thanks
Best Regards

Amir :bigeyes:
 
#128
Would anyone please post some application advice and limitations for these boards for us "novice" DIYers. Like current limitations, parts selection/suggestion, what come before and what should be after the board, the correct placement to get the most benefit . . . etc.
Click to expand...

It's difficult to be really specific, but they have application almost anywhere. I've used them for analogue and digital supplies. For examples of where I've found them beneficial, I have them in CD players (analogue and clock supplies), preamps, phono stages, tuners etc. Even an portable minidisc player was transformed by an external PSU, although this is a little extreme, maybe 😉

The boards are capable, if built as per my standard instructions and fitted with adequate heatsinking to the pre-reg / pass transistor, of supplying the full current up to the limit of the pre-regulator (1.5A for LM317 etc.). Normally they'd be used at lower levels than this, 1-200mA is the norm.

Despite the obvious improvment in performance over standard regulators there is always a benefit to splitting supply feeds within a device - how far you go really depends upon how extreme you want to be. A colleague of mine used 8 of these reg's inside a preamp to provide a seperate feed for every single stage and it works very well indeed.

As for the surrounding circuitry you'll need to use a bit of common sense here - there's no specific requirements but it's always wise with ANY feedback-based regulator to watch what you connect at the output. High-Q film caps, for example, can cause stability problems, although if decoupled by a bit of trace inductance they'll be fine.

Input requirements are primarily a high enough DC voltage feed; you'll need an input voltage of 2.5V + the pre-regulator drop-out voltage, which varies with current / load etc. Choose a sensible margin here, and devices like the LT1086 can be used in place of the LM317 to lower dropout a bit.

Ideally the reg's should be as close to the load as possible, although remote sensing can be utilised to get the performance of the reg to the required point.

The rest is just Ohms law and good practice, my manual gives good examples of the 'right' and 'wrong' ways to wire a load to the reg's.

Andy.
 
#130
Amir,

There are no requirements for additional external components for the regualtor although there may be additional caps etc. required for the circuit you are powering, depending upon what the circuit needs for stability, how far the reg's are from the circuit and a host of other things.

This is where you have to use good engineering practice to determine what is necessary in a given application, there's no universal advice here, but plenty out there in manufacturers app. notes etc.

Stuff like this will tell you a lot: -

An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change. (Analog Devices AN-202)

High Speed Amplifier Techniques (Linear Technology AN-47)

Get learning 😉

Andy.
 
#131
Why don't you combine the + and - boards together on a single pcb, with scoring, so that you can easily seperate. This will make the price of the boards cheaper in the end, since you will only have to buy a single type of board, meaning a larger quantity.

I did this for my gainclone boards, putting 3 boards onto a single pcb, and had scoring added to make them easily break apart:
http://brian.darg.net/gallery/nigc-kit

What is the board size? I can get some quotes from the place that I got my boards done.

Also, most board manufacturers can put a colored soldermask on the board for a bit extra. It cost me an extra $150 for the entire order to get the red soldermask on the boards, and I think that it was worth it.

--
Brian
 
#132
transducer said:
The numbers on the boards is getting pretty high. What is the next price break? I'd be interested in ordering more boards if it got even cheaper.

Will there be an opportunity to order more boards if the price can be brought down? I'm going away for the weekend, will be back Sunday night (deadline!), so will be out of touch until then. I think we could easily hit 200 boards of each!

RonS
Click to expand...


Andy should be able to make some money out of this deal, and I hope he is. He has already been gracious (VERY) enough to help so let's not push it, OK?
We got down to a reasonable limit $5/board so we should give it a rest.

BrianGT
good point, there maybe a retooling fee and the price may increase since the baord is bigger so there maybe a cutoff point.
I am not worried about the price but for me it would be convenient to combine boards as it would make the layout more organized and neat looking.
 
#133
Brian,

The primary reason was that +ve sales outstrip -ve sales to my primary market, by a factor of at least 3 to one.

Hence I'd end up with a lot of -ve boards on my hands!

The other reason was that at the time I was working within the contraints of the free version of Eagle, with it's stupid board-area limitation. I now have a better package, with more flexibility.

Andy.

P.S. Nice 'picture story' on the gainclone page.
 
#134
ALW said:
Brian,

The primary reason was that +ve sales outstrip -ve sales to my primary market, by a factor of at least 3 to one.

Hence I'd end up with a lot of -ve boards on my hands!

The other reason was that at the time I was working within the contraints of the free version of Eagle, with it's stupid board-area limitation. I now have a better package, with more flexibility.

Andy.

P.S. Nice 'picture story' on the gainclone page.
Click to expand...

The scoring is not done in the pcb software. I just made a line in the keepout layer, along with some text noting that it was for scoring. This is pretty standard.

As for having extra boards, don't seperate them yourself, just sell the pcbs as a combined set.

Judging from what was written earlier:
The Totals so far are:
+Ve Boards Total 164
-Ve Boards Total 124

What is the size of the pcb?

--
Brian
 
#137
Thankx guys!!

I can use them.
I wonder if anybody knows where to get the opamps (AD825 or AD817 for 5V) for those regulators for a faire price. I looked at farnel, their price is:
AD817 Eur6,11 (1-9) or Eur4 (10-99) or Eur 2,85(100+)
AD825 Eur6,75 (1-9) or Eur4,54 (10-99) or Eur2,44 (100+)

Can't find them anywhere else.
Somebody knows another less expensive address??

Henk
 
#139
Smiffy said:
Hi
Id like to get 12 pos boards and 4 neg boards but I don't know how to edit the wicki.Can anyone help.Thanks.
Smiffy
Click to expand...

follow this link,

http://www.diyaudio.com/wiki/index.php?action=edit&page=ALW+regulator+pcb+group+buy

under
=== UK ===
(distribution, mark & raja)
you will see a list of uk members, at the bottom of these members you will see,
||name||country||0||0||0||0||0||0||0||

edit this to,

||smiffy||uk||12||4||0||0||0||0||0||

select preview and go down the page the check,

followed by save if you are happy

also you could update the uk total if you feel confident
 
#140
Re:AD825's

If anyone in the UK is VAT registered, the cheapest way to get these is to order direct from ADi's website, in US dollars.

With an exchange rate as it is, at present, they're a good deal, and much cheaper than Farnell. Delivery is often a few weeks though.

Andy.
 
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